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One should stick by one's soul, and by nothing else. In one's soul, one knows the truth from the untruth, and life from death. And if one betrays one's own soul-knowledge one is the worst of traitors.

D. H. Lawrence (2007). “The Letters of D. H. Lawrence: October 1916-June 1921”, p.118, Cambridge University Press
One should stick by one's soul, and by nothing else. In one's soul, one knows the truth from the untruth, and life from death. And if one betrays one's own soul-knowledge one is the worst of traitors.